· Should the spring chamber be protected when the hard-alloy-sealing ball valve is used as slag lock valve or used in slag or slurry material? 2011-06-01

· Which type should be chosen for the high temperature hard-alloy-sealing wear-proof ball valve, the float ball or the fixed ball? 2011-06-01

· Should the oxygen valve be the hard-alloy-sealing ball valve? 2011-05-09

· Which of the rotating disc valve and sliding disc valve has higher cost-performance ratio? 2011-03-08

· Why it is so cheap for some factory to repair the hard-alloy-sealing wear-proof ball valve? 2011-03-03

· Is the hard-alloy-sealing ball valve the same as the wear-proof ball valve? 2011-02-20

· Why the rotating disc valve has longer serving life than hard-alloy-sealing ball valve? 2010-12-22

· How to avoid the medium stacking in the bearing chamber of wear-proof ball valve for coal chemical industry by improving the product design? 2010-11-29

· Why high temperature hard-alloy-sealing wear-proof ball valves always get a bite in open operation even through made by super factory? 2010-11-29

· How to choose the safety factor for the actuator of the hard-alloy-sealing wear-proof ball valve? 2010-11-29

· What is the advantage to choose the disc spring for the hard-alloy-sealing wear-proof ball valve? 2010-10-18

· Why most hard-alloy-sealing ball valves are equipped with coil spring instead of disc spring for abrasion compensation? 2010-10-18

· What is the advantage of quantitative compression technology of hard-alloy-sealing wear-proof ball valve ? 2010-10-18

· Why the normal closed high temperature hard-alloy-sealing wear-proof ball valve always has a bite when open and can not be open or closed in place? 2010-10-18

· Why should double bearings structure be used in the high pressure hard-alloy-sealing wear-proof ball valve? 2010-10-18

· Why hardening is needed for the valve stem of the high pressure hard-alloy-sealing wear-proof ball valve? 2010-10-18